Recently we found Paul Madary's blog post about digital signatures in a Univeral Application (UWP) with iText 7, and we wanted to share it. Paul gracefully agreed to let us do that, and as a bonus we upgraded the code to be usable out-of-the-box with iText 7.1.3. The only change needed is the method SignDocumentSignature.

A big thank you to our Q3 top contributors!

There are so many people that contribute information to us in order to help improve our code, products and projects. We want to make sure that our top contributors are being recognized for the help they give and that they know how much we appreciate them.

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Common Error messages

I get "version mismatch error"

You are most likely combining the wrong library version with your license key. If you bought an iText 5 license, please use version 1.x.y. If you bough an iText 7 license, please use 3.x.y.

I get "signature corrupted"

This can mean a few things:

The license key file was corrupted during the download. Try downloading it again and loading the newly downloaded file. If the issue still persists, contact us so that we can resolve this issue.

You changed the contents of your license key. Please revert to the original state of the license key. If you want to change the content of the key, please contact our sales department.

I get "product not found"

You are trying to use an add on product without having loaded a license key that contains a valid license for that product. If you did buy a license for the add-on, please contact our sales department to rectify this. If you didn't buy a license and you want to try out the add on, you may want to register for a trial license.

I get "The license info of already loaded license doesn't match the new one."

You are most likely trying to load an additional license key containing new add ons. This can only work if the core information is the same. If it's not the same and it should be, contact us to rectify this issue. If it's not the same, please only use your own license key and don't pass your license keys around.

Where can I download the license key library?

Ready to use iText?

As always, if you have any technical questions, you can contact support with your valid support subscription or head over to one of our community support pages on Stack Overflow to see if your question has already been answered for our AGPL users.